New card backs available

Outside of Korea it won't be possible to obtain the pre-reg card back as it'll require a Korean ID and a sign-up on the One Store site. I think you have to make a purchase too.

Huawei doesn't appear to be active yet even though its in the client. Unless this ends up being a China only card back.

My expectation is that if they aren't obtainable outside of those countries, given some time, they'll be available for gold.

I'm wrong, it looks like it is possible currently if you use an emulator. 

You need to change the model number of your emulator to a huawei device id, like "RTE-AL00", which is the recently launched Huawei nova 9 Pro. If you need to enter a manufacturer and brand, then HUAWEI is the correct field for both.

I'd like to! The last time I did a guide though was all the way back for the Samsung promotion and I believe all the emulators have changed quite a bit so it'll take quite a bit of time to test them all out and see which one ends up being the most friendly.

I could write a client patch faster, in the same way that Hearthstone Access works. lol. The only downside is people would be sketched out patching their clients, even temporarily. The odds of Blizzard banning for such a thing, historically speaking, is 0. Though, folks, you should never download and execute code you don't trust the source for. Remember that!